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Anti-rotation mechanism for movable scroll in scroll compressor |
| 6457959 |
Anti-rotation mechanism for movable scroll in scroll compressor
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| Patent Drawings: | |
| Inventor: |
Nakane, et al. |
| Date Issued: |
October 1, 2002 |
| Application: |
09/846,938 |
| Filed: |
May 1, 2001 |
| Inventors: |
Fujii; Toshiro (Kariya, JP)
Murakami; Kazuo (Kariya, JP)
Nakane; Yoshiyuki (Kariya, JP)
Yamamoto; Shinya (Kariya, JP)
Yokomachi; Naoya (Kariya, JP)
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| Assignee: |
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho (Kariya, JP) |
| Primary Examiner: |
Vrablik; John J. |
| Assistant Examiner: |
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| Attorney Or Agent: |
Morgan & Finnegan, LLP |
| U.S. Class: |
418/55.2; 418/55.3 |
| Field Of Search: |
418/55.2; 418/55.3 |
| International Class: |
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| U.S Patent Documents: |
4522574; 4731000; 6287096 |
| Foreign Patent Documents: |
58-30403; 60-182382 |
| Other References: |
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| Abstract: |
An improved scroll compressor having a movable scroll that orbits without being inclined. The compressor has a fixed scroll formed in the housing. The movable scroll is accommodated in the housing and mates with the fixed scroll. The movable scroll is driven by a drive shaft via a crank mechanism. A flange is formed at the periphery of the movable scroll and lies perpendicular to the drive shaft. A groove is formed in the housing. The groove is slightly wider than the thickness of the flange. The flange is slidably accommodated in the groove. Support holes extend in the housing. A pin is supported in each support hole. The ends of each pin are received in guide holes through the flange. Since engagement of the flange and the groove prevents the movable scroll from being inclined, the pin is maintained parallel to the guide holes and follows the wall of the guide holes. As a result, uneven wear of the pins and the guide holes is avoided. |
| Claim: |
What is claimed is:
1. A scroll compressor for compressing gas comprising: a housing having an annular groove that includes a pair of walls facing each other; a fixed scroll formed in thehousing; a drive shaft rotatably supported in the housing; a movable scroll accommodated in the housing to mate with the fixed scroll; a crank mechanism located between the drive shaft and the movable scroll for driving the movable scroll inaccordance with the rotation of the drive shaft: a projection extending radially from the movable scroll along a plane perpendicular to the axis of the drive shaft, wherein the projection is located in the annular groove and slides along the walls of theannular groove, wherein the projection has a thickness measured in the axial direction of the drive shaft, and wherein the distance between the groove walls is greater than the thickness of the projection by a predetermined value; and a restrictionmechanism for inhibiting rotation of the movable scroll with respect to the axis of the movable scroll and for permitting orbital movement of the movable scroll, the restriction mechanism includes a pin, the pin has ends, the housing further having asupport hole formed in one of the groove walls to support the pin, and a guide hole formed in the projection to correspond to the support hole to loosely fit the pin, the guide hole has an inner diameter greater than that of the support hole so that thepin orbits within the guide hole by contacting an inner periphery surface of the guide hole while remaining parallel to the drive shaft, wherein the support hole is formed in one of the groove walls, and the guide hole is a through hole formed in theprojection to correspond to the support hole, wherein one end of the pin is supported by the support hole, undo wherein the other end of the pin is loosely fitted in the glide hole.
2. A scroll compressor for compressing gas comprising: a housing having an annular groove that includes a pair of walls facing each other; a fixed scroll formed in the housing; a drive shaft rotatably supported in the housing; a movablescroll accommodated in the housing to mate with the fixed scroll; a crank mechanism located between the drive shaft and the movable scroll for driving the movable scroll in accordance with the rotation of the drive shaft; a projection extendingradially from the movable scroll along a plane perpendicular to the axis of the drive shaft, wherein the projection is located in the annular groove and slides along the walls of the annular groove, wherein the projection has a thickness measured in theaxial direction of the drive shaft, and wherein the distance between the groove walls is greater than the thickness of the projection by a predetermined value; and a restriction mechanism for inhibiting rotation of the movable scroll with respect to theaxis of the movable scroll and for permitting orbital movement of the movable scroll, the restriction mechanism includes a pin, the pin has ends, the housing further having a support hole formed in one of the groove walls to support the pin, and a guidehole formed in the projection to correspond to the support hole to loosely fit the pin, the guide hole has an inner diameter greater than that of the support hole so that the pin orbits within the guide hole by contacting an inner periphery surface ofthe guide hole while remaining parallel to the drive shaft, wherein the support hole includes a first support hole formed in one of the groove walls and a second support hole formed in the other groove wall, and the guide hole is a through hole formed inthe projection to correspond to the support hole, wherein the ends of the pin are supported by the support holes, and wherein a mid-section of the pin is loosely fitted in the guide hole. |
| Description: |
BACKGROUND OF THE INVENTION
The present invention relates to scroll compressor for compressing gas.
FIG. 10 shows such a scroll compressor, which was disclosed in Japanese Unexamined Patent Publication No. 5-321850. The compressor includes a fixed scroll 52 formed in a center housing part 51. A drive shaft 56 is rotatably supported by a fronthousing part 55. The front housing part 55 and the center housing part 51 form a scroll housing for accommodating a movable scroll 53. A compression chamber 54 is defined between the movable scroll 53 and the fixed scroll 52. The movable scroll 53 issupported by a crank mechanism 56a. The crank mechanism 56a converts rotation of the drive shaft 56 into eccentric (orbital) movement of the movable scroll 53 relative to the drive shaft 56. Orbital movement of the movable scroll 53 causes the volumeof the compression chamber 54 to change from the maximum to the minimum and then from the minimum to the maximum. As the volume of the compression chamber 54 is decreased, gas in the compression chamber 54 is compressed.
A compression reaction force generated by compressing gas acts on the rear face 55a of the front housing part 55. Guide holes 55b (only one is shown) are formed in the rear face 55a. Support holes 53b are formed in a base plate 53a of themovable scroll 53. A pin 57 is fitted in each support hole 53b. The distal end of each pin 57 is inserted into the corresponding guide hole 55b. Each pin 57, the corresponding hole 53b and the corresponding guide hole 55b form an anti-rotationmechanism. When rotation of the drive shaft 56 is transferred to the movable scroll 53 by the crank mechanism 56a, the anti-rotation mechanisms prevent the movable scroll 53 from rotating, while permitting the movable scroll 53 to orbit at apredetermined radius.
The diameter of the support holes 53b is slightly greater than the diameter of the pins 57 such that each pin 57 rotates in the corresponding support hole 53b. The pins 57 are supported by the movable scroll 53 in a cantilevered manner. Therefore, when receiving a radial force, each pin 57 is slightly inclined in the corresponding hole 53b. When the movable scroll 53 is orbiting, inclination of the pins 57 causes the load to concentrate at the open end of the hole 53b, whichexcessively wears the open end of the hole 53b. The wearing of the open end of the holes 53b causes the inclination of the pins 57 to increase. As a result, the orbit radius of the movable scroll 53 eventually exceeds the initial value. A greaterorbit radius of the scroll 53 degrades the compression efficiency of the compressor. If the pins 57 are supported by the front housing part 55 and the guide holes are formed in the base plate 53a, the compressor will have the same problem.
In order to prevent the pin 57 from inclining, the proximal end of each pin 57 may be fixed within the corresponding support hole 53b, and a bearing may be fitted to the distal end of each pin 57. The outer surface of the bearing rolls on thewall of the guide hole 55b. This structure prevents the pins 57 from inclining relative to the movable scroll 53. Thus, the holes 53b are not unevenly worn. However, when the compressor is started, the movable scroll 53 is slightly inclined. At thistime, each bearing unevenly contacts the open end of the corresponding guide hole 55b. This unevenly wears the bearings and the open end of the guide holes 55b, which eventually increases the orbit radius of the movable scroll 53. Accordingly, thecompression efficiency of the compressor is lowered.
SUMMARY OF THE INVENTION
Accordingly, it is an objective of the present invention to provide a scroll compressor that improves the compression efficiency.
To achieve the foregoing and other objectives and in accordance with the purpose of the present invention, a scroll compressor for compressing gas is provided. The scroll compressor includes a housing having an annular groove that includes apair of walls facing each other, a fixed scroll formed in the housing, a drive shaft rotatably supported in the housing, a movable scroll accommodated in the housing to mate with the fixed scroll and a crank mechanism. The crank mechanism is locatedbetween the drive shaft and the movable scroll for driving the movable scroll in accordance with the rotation of the drive shaft. A projection extends radially from the movable scroll along a plane perpendicular to the axis of the drive shaft. Theprojection is located in the annular groove and slides along the walls of the annular groove, and has a thickness measured in the axial direction of the drive shaft. The distance between the groove walls is greater than the thickness of the projectionby a predetermined value. The scroll compressor further includes a restriction mechanism for inhibiting rotation of the movable scroll with respect to the axis of the movable scroll and for permitting orbital movement of the movable scroll. Therestriction mechanism includes a restriction member supported by the projection or the groove walls.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
BRIEF DESCRIPTION OFTHE DRAWINGS
The features of the present invention that are believed to be novel are set forth with particularity in the appended claims. The invention, together with objects and advantages thereof, may best be understood by reference to the followingdescription of the presently preferred embodiments together with the accompanying drawings in which:
FIG. 1 is a cross-sectional view showing a scroll compressor according to a first embodiment of the present invention;
FIG. 2 is an exploded perspective view showing the compressor of FIG. 1;
FIG. 3 is an enlarged partial cross-sectional view illustrating an anti-rotation mechanism;
FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 1;
FIG. 5 is an enlarged partial cross-sectional view illustrating a an anti-rotation mechanism according to a second embodiment;
FIG. 6 is an enlarged partial cross-sectional view illustrating a an anti-rotation mechanism according to a third embodiment;
FIG. 7 is an enlarged partial cross-sectional view illustrating a an anti-rotation mechanism according to a fourth embodiment;
FIG. 8 is an enlarged partial cross-sectional view illustrating a an anti-rotation mechanism according to a fifth embodiment;
FIG. 9 is a perspective view showing a movable scroll according to another embodiment; and
FIG. 10 is a cross-sectional view illustrating a prior art scroll compressor.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A scroll compressor according to a first embodiment of the present invention will now be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the scroll compressor includes a center housing part 11, a front housing part 12 and a rear housing part 13, which are made of aluminum alloy. The center housing part 11, the front housing part 12 and the rear housing part 13are secured to one another by bolts (not shown). As shown in FIG. 2, a recess 122 is formed in the front housing part 12. A rim 111 is formed in the front end (left side as viewed in FIG. 1) of the center housing part 11. A rim 121 is formed in therear end (right side as viewed in FIG. 1) of the front housing part 12. The rim 111 is secured to the rim 121. The rear housing part 13 is secured to the rear end of the center housing part 11.
A fixed scroll 14 is integrally formed with the center housing part 11 and includes a base plate 141 and a volute portion 142 protruding from the base plate 141. The front housing part 12 and the center housing part 11 accommodate a movablescroll 15. The movable scroll 15 includes a base plate 151, a volute portion 152 protruding from the rear side of the base plate 151, a boss 153 protruding from the front side of the base plate 151 and a radial projection, or flange 154. The flange 154is integrally formed with the periphery of the base plate 151 such that the flange 154 lies in a plane perpendicular to the axis of the drive shaft 18. A compression chamber 16 is defined between the volute portion 152 of the movable scroll 15 and thevolute portion 142 of the fixed scroll 14. An annular suction chamber 17 is defined between the volute portions 142, 152 and the inner wall of the center housing part 11. A crank chamber 28 is defined between the front housing part 12 and the baseplate 151 of the movable scroll 15. A crank mechanism 29 is accommodated in the crank chamber 28. The crank mechanism 29 orbits the movable scroll 15.
As shown in FIG. 1, the drive shaft 18 is rotatably supported by a bearing 19 in the front housing part 12. The crank mechanism 29 includes the drive shaft 18, a crank pin 20, a bushing 21 and a counter weight 23. As shown in FIGS. 2 and 4, thecrank pin 20 extends rearward from the drive shaft 18 and is radially offset from the axis of the drive shaft 18. The bushing 21 has an eccentric hole 22. The bushing 21 is fitted in the boss 153 with a bearing 24. The distal end of the crank pin 20is fitted in the eccentric hole 22. The counterweight 23 is integrally formed with the proximal end of the crank pin 20.
The structure of the anti-rotation mechanisms 25 (only one is shown) will now be described with reference to FIGS. 1 to 3. The anti-rotation mechanisms 25 permit the movable scroll 15 to orbit while prohibiting its rotation. As shown in FIG. 1,the recess 122 of the front housing part 12 and the front face 112 of the center housing part 11 define an annular groove. The axial dimension of the annular groove is slightly greater than that of the flange 154. Most of the flange 154 is located inthe groove.
As shown in FIG. 2, four support holes 155 extend through the flange 154. The support holes 155 are equally spaced apart in the circumferential direction of the flange 154. A pin 26 is inserted in each support hole 155. The diameter of thepins 26 is slightly smaller than that of the support holes 155 so that each pin 26 is permitted to rotate. Four guide holes 113 are formed in the front face 112 of the center housing part 11. As shown in FIGS. 1 and 3, another four guide holes 123 areformed in the recess 122. Each pin 26 is loosely fitted in the corresponding pair of guide holes 113 and 123.
As shown in FIG. 2, an annular spacer 27 is located between the front end face 158 of the flange 154 and the front housing part 12. The compression reaction force acting on the movable scroll 15 is received by the front housing part 12 via thespacer 27. The spacer 27 has four through holes 271. The pins 26 are inserted in the through holes 271. The distance X (see FIG. 3) between the rear end face 159 of the flange 154 and the front face 112 of the center housing part 11 can be changed byaltering the thickness of the spacer 27. In the embodiment of FIGS. 1 to 4, the distance X is 0.01 mm.
As shown in FIG. 3, a recess 156 is formed about each support hole 155 on each face 158, 159 of the flange 154. That is, the support holes 155 are countersunk The recesses 156 facilitate the entry of atomized oil, which is dispersed in therefrigerant gas, into the support holes 155. When the drive shaft 18 rotates, engagement of the pins 26 and the guide holes 113, 123 prevents the movable scroll 15 from rotating while permitting the movable scroll 15 to orbit about the axis of the driveshaft 18. The orbit radius of the movable scroll 15 is calculated by subtracting the radius of the pin 26 from the radius of the guide holes 113, 123.
As shown in FIG. 1, an inlet 30 is formed in the front housing part 12. The inlet 30 is connected to an external refrigerant circuit (not shown). Refrigerant gas is drawn into the crank chamber 28 through the inlet 30. As shown in FIGS. 1 and2, suction passages 157 are formed in the flange 154 to conduct refrigerant gas in the crank chamber 28 to the suction chamber 17. A discharge port 31 is formed in the center of the base plate 141 of the fixed scroll 14 to communicate the compressionchamber 16 with a discharge chamber 32 formed in the rear housing part 13. A discharge valve flap 33 is located at the outer end of the discharge port 31. A stopper 34 limits the opening amount of the discharge valve flap 33. An outlet 35 is formed inthe rear housing part 13. Pressurized gas in the discharge chamber 32 is discharged to the external refrigerant circuit through the outlet 35.
The operation of the scroll compressor will now be described.
When the drive shaft 18 is rotated, the crank pin 20, the bushing 21 and the bearing 24 causes the movable scroll 15 to orbit about the axis of the drive shaft 18 without rotating the scroll 15. Orbital movement of the scroll 15 drawsrefrigerant gas into the suction chamber 17 through the inlet 30, the crank chamber 28 and the suction passage 157. The refrigerant gas flows from the suction chamber 17 to the compression chamber 16 along the volute portions 142, 152. The orbitingmovement of the movable scroll 15 moves the gas along the volute portions 142, 152 toward the center of the compression chamber 16, while gradually compressing the gas. The compressed gas pushes open the discharge valve flap 33 and flows into thedischarge chamber 32 through the discharge port 31. The gas is then supplied to the external refrigerant circuit through the outlet 35.
The scroll compressor of FIGS. 1 to 4 has the following advantages. (1) The flange 154 formed on the movable scroll 15 lies in a plane perpendicular to the axis of the drive shaft 18. The flange 154 is located between the center housing part 11and the front housing part 12, and the distance X exists between the flange 154 and the center housing part 11. The mid-section of each pin 26 engages the flange 154, and the ends of each pin 26 are loosely fitted in the corresponding guide holes 113,123. This construction permits the movable scroll 15 to orbit without rotating. When the movable scroll 15 is orbiting, the forces act evenly on the parts of each pin 26 that engage the guide holes 113, 123 which prevents the open ends of thecorresponding support hole 155 from being worn excessively. As a result, the orbit radius of the movable scroll 15 is not increased and the compression efficiency of the compressor is not lowered. The durability of the compressor is also improved. (2)The compression reaction force urges the flange 154 to the left as viewed in FIG. 3, which creates a space between the rear end face 159 of the flange 154 and the front face 112 of the center housing part 11. However, the spacer 27 maintains the space Xbetween the rear face 159 of the flange 154 and the front face 112 of the center housing 10 part 11 at a relatively narrow dimension (0.01 mm). This prevents the movable scroll 15 from being inclined, particularly when the movable scroll 15 startsorbiting. As a result, the movable scroll 15 is started smoothly and operates smoothly thereafter. (3) Dimensional tolerances in measurement and assebly of the compressor cause the distance X to vary. The variations of the distance X result invariations of characteristics of manufactured compressors. However, the variations of the distance X are compensated for by simply changing the thickness of the spacer 27, which is located between the recess 122 and the flange 154. Accordingly,variations of characteristics of manufactured compressors are eliminated. The spacer 27 may be made of a material having a high wear resistance such as stainless steel, and the flange 154 may be made of aluminum alloy. This prevents engaging surfacesof the spacer 27 and the flange 154 from being easily worn, thereby improving the durability of the compressor. (4) The recesses 156 are formed about the ends of each support hole 155. The recesses 156 allow refrigerant gas containing atomized oil toeasily enter between the support hole 155 and the pin 26. As a result, the pin 26 smoothly slides on the inner wall of the support hole 155, which prevents the pin 26 and the support hole 155 from wearing. (5) The flange 154 is integrally formed withthe movable scroll 15, which facilitates the manufacture.
A scroll compressor according to a second embodiment will now be described with reference to FIG. 5. The differences from the embodiment of FIGS. 1 to 4 will mainly be discussed below.
In the second embodiment, front support holes 12a are formed in the front housing part 12 and corresponding rear support holes 11a are formed in the center housing part 11. Guide holes 15a are formed in the movable scroll 15. Each pin 26extends through one of the guide holes 15a and is supported by the corresponding front and rear support holes 12a, 11a. Therefore, the axial center of each pin 26 engages the wall of the associated guide hole 15a, and the ends of each pin 26 aresupported by the corresponding support holes 11a, 12a. The diameter of each guide hole 15a is greater than the diameter of the pins 26. The orbit path of the movable scroll 15 is defined by contact between the guide pins 26 and the guide holes 15a.
The construction of FIG. 5 prevents the pins 26 from inclining when the movable scroll 15 orbits. Therefore, neither the support holes 11a, 12a nor the guide holes 15a are worn near their openings, which prevents the orbit radius of the movablescroll 15 from increasing. As a result, the compression efficiency of the compressor will not degrade. Further, the construction of FIG. 5 smoothly orbits the movable scroll 15. The embodiment of FIG. 5 has the advantages (2) to (5) of the embodimentof FIGS. 1 to 4.
A scroll compressor according to a third embodiment will now be described with reference to FIG. 6. The differences from the embodiment of FIGS. 1 to 4 will mainly be discussed below. In the embodiment of FIG. 6, anti-rotation mechanisms 25(only one is shown) are located between the front housing part 12 and the center housing part 11. The construction of the anti-rotation mechanism 25 of FIG. 6 is similar to that of a ball bearing. The mechanism 25 includes a flange 154, a support hole15b, a ball 41 and guide holes 11b, 12b. The support hole 15b is formed in the flange 154 for rotatably accommodating the ball 41. The ball 41 is located between the guide hole 11b formed in the center housing part 11 and the guide hole 12b formed inthe front housing part 12. The guide holes 11b, 12b have concave surfaces corresponding to the shape of the ball 41. The mid-section of the ball 41 is supported by the flange 154, while the ends of the ball 41 engage the guide holes 11b, 12b.
When the movable scroll 15 orbits, forces act evenly on the walls of the guide holes 11b, 12b via the ball 41. This prevents the support hole 15b and guide holes 11b, 12b from being unevenly worn. Further, the embodiment of FIG. 5 has theadvantages (2) to (5) of the embodiment of FIGS. 1 to 4.
A scroll compressor according to a fourth embodiment will now be described with reference to FIG. 7. The differences from the embodiment of FIGS. 1 to 4 will mainly be discussed below. In the embodiment of FIG. 7, the rear guide holes 113 shownin FIGS. 1 to 4 are omitted. Blind support holes 15c are formed in the flange 154. One end of each pin 26 is inserted in one of the support holes 15c. The other end of the pin 26 is inserted into the guide hole 123. The outer surface of each pin 26is parallel to the wall of the corresponding guide hole 123. The distance X between the front face 112 of the rim 111 and the flange 154 is 0.01 mm, as in the embodiment of FIGS. 1 to 4. Therefore, the flange 154, which is located between the housings11, 12, lies in a plane perpendicular to the drive shaft 18. The movable scroll 15 is prevented from inclining relative to the plane.
The construction of FIG. 7 prevents the flange 154 (the movable scroll 15) from inclining when the movable scroll 15 orbits. Thus, the pins 26 are not inclined relative to the inner surface of the guide holes 123. Therefore, the construction ofFIG. 7 prevents the support holes 15c and the guide holes 123 from being unevenly worn. As a result, the orbit radius of the movable scroll 15 is not increased and the compression efficiency does not degrade. Further, the construction of FIG. 7 allowsthe movable scroll 15 to smoothly orbit. Also, the embodiment of FIG. 7 has the advantages (3) to (5) of the embodiment of FIGS. 1 to 4.
A scroll compressor according to a fifth embodiment will now be described with reference to FIG. 8. The differences from the embodiment of FIG. 5 will mainly be discussed below. In the embodiment of FIG. 8, the rear support holes 11a shown inFIG. 5 are omitted. Each pin 26 is supported by a support hole 124 formed in the front housing part 12. The outer surface of each pin 26 is parallel to the inner surface of the corresponding guide hole 15a. The distance X between the front face 112 ofthe rim 111 and the flange 154 is 0.01 mm, as in the embodiment of FIGS. 1 to 4. Therefore, the flange 154, which is located between the housings 11, 12, lies in a plane perpendicular to the drive shaft 18. The movable scroll 15 is prevented frominclining relative to the plane.
The construction of FIG. 8 prevents the flange 154 (the movable scroll 15) from inclining when the movable scroll 15 orbits. Therefore, each support hole 124 and each guide hole 15a are prevented from being unevenly worn. As a result, the orbitradius of the movable scroll 15 is not increased, and the compression efficiency is not lowered. Further, the construction of FIG. 8 allows the movable scroll 15 to smoothly orbit.
The embodiment of FIG. 8 has the advantages (3) to (5) of the embodiment of FIGS. 1 to 4.
Although only five embodiments of the present invention have been described herein, it should be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit orscope of the invention. Particularly, it should be understood that the invention may be embodied in the following forms.
In the embodiment of FIGS. 1 to 4, each pins 26 may be fixed to the flange 154 and bearings may be fitted to the ends of the pin 26. The bearings roll along the walls of the guide holes 113, 123. This construction prevents the pin 26 frominclining relative to the inner surfaces of the guide holes 113, 123. Therefore, uneven wear of the guide pins 26 and the guide holes 113, 123 is prevented.
In the embodiment of FIG. 5, bearings may be located between the outer surface of each pin 26 and the inner surfaces of the support holes 11a, 12a. Alternatively, a bearing may be located between each guide pin 26 and the corresponding guidehole 15a.
The shape of the flange 154 may be altered. For example, as shown in FIG. 9, the flange 154 may be replaced by projections 154a extending radially from the base plate 151 of the movable scroll 15.
The flange 154 may be made of material different from that of the base plate 151. In this case, the flange 154 may be integrated with the base plate 151 by insert molding.
The distance X may be changed between 0.01 mm and 0.2 mm.
The number of the anti-rotation mechanisms 25 may be arbitrarily determined.
Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appendedclaims.
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